Hey guys,
This is my first time building a kayak so don't take my word as gospel. Also, in a previous life i did a lot of electrical and control work so the content herein might not be comfortable for a few people out there. It's just basic electrical stuff though.

The kayak is my winter project and I only have a garage, unheated, and for the most part open to the elements - there's a noticeable gap under the garage door and open eaves, and no insulation, so on a given day the temperature inside the garage is a few degrees colder than outside. Also, I live in NE PA on the top of a mountain so it ain't exactly balmy. Temps are normally in the single digits at night.

What I did was wire some light fixtures between the stations of my strongback and use incandescent bulbs controlled by a remote thermostat to heat the kayak. Trying to heat the entire garage would be ridiculous given the fact that it's "open" and I didn't want a $700 electric bill, although I do have a kero heater I use when I'm working in there. I cover the kayak with as many old blankets as I could find. The temp controller keeps the kayak at a toasty 61-65 degrees (I have it set for a 4-degree differential) even when the rest of the garage is in the teens. Colder than that outside and it still holds in the high 50s. I'm using Titebond III b/c it buys me an extra 10 degrees of curing temp (45 vs. 55 degrees for normal TB according to the manufacturer's instructions).

I have 100-watt bulbs in the center, 60s further out and 40s in both of the last 2 end stations. Not all stations have a bulb, and the temp sensor is located inside an un-bulbed station so I can be sure the coldest stations are the ones calling for heat.

Disclaimer: Consult a licensed electrician. Potential fire hazard. Don't leave stuff on the lightbulbs (glue drips come to mind). If you burn your house down you didn't get this idea from me.

A suggested place to find the Johnson A419 controller I used is any online supply shop for homebrewing beer. These are commonly used for fermentation temp control.

Pics to follow.